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Free Fall

A ball is thr...

Question

A ball is thrown upwards. It takes 4 s to reach back to the ground. Find its initial velocity.

A

30 m s^{- 1}

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B

10 m s^{- 1}

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C

40 m s^{- 1}

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D

20 m s^{- 1}

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Solution

The correct option is C $20 m s^{- 1}$
$Using v = u + a t$
Time of Flight $= \frac{2 u}{g}$
Where u is the initial velocity and g is acceleration due to gravity
$4 = \frac{2 u}{10}$
$u = 20 m s^{- 1}$

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